Fediverse

Not nearly as in-depth due to time limits (and mostly focused on the Xi Jinping era) but Red Pen's A Summary of Xi Jinping's Governance of China can be a good primer! There's also This is how China's economic model works: Explaining Socialism with Chinese Characteristics by Geopolitical Economy Report.

Really, in order to understand the PRC, you at least need to understand Mao, the Gang of Four, Deng Xiaoping, and Xi Jinping. There were other leaders, but these have perhaps had the largest impact on the PRC of today. Xi Jinping Thought upholds Mao Zedong Thought and Deng Xiaoping Theory, while believing the Gang of Four to have been left-deviationists and the Cultural Revolution to have contained more excess than was worth.

Also, the Prolewiki page for Socialism with Chinese Characteristics: A Guide for Foreigners is pretty poorly formatted, and extremely lengthy, so I recommend either going to the anna's archive link and downloading the source directly, or reading these:

1. Qiao Collective's Introductory Socialism with Chinese Characteristics Study Guide

2. Socialism with Chinese Characteristics ProleWiki page

3. Socialist Market Economy ProleWiki Page

4. People's Republic of China ProleWiki Page

5. My "Read Theory, Darn It!" Introductory Marxist-Leninist Reading Guide

6. Has China Turned to Capitalism? Reflections on the Transition from Capitalism to Socialism by Domenico Losurdo

7. China Has Billionaires by Roderic Day

8. The Long Game and its Contradictions

9. Imperialism, The Highest Stage of Capitalism by Vladimir Lenin

10. Super-Imperialism: The Origins and Fundamentals of U.S. World Dominance by Michael Hudson

11. Marxism is a Science by Deng Xiaoping

12. Regarding the Construction of Socialism With Chinese Characteristics by Xi Jinping